A method for effectively improving the utilization rate of casting and rolling rolls in aluminum alloy production

Abstract

The present invention discloses a method for effectively improving the utilization rate of casting rolls in aluminum alloy production. The method comprises the following steps: the aluminum melt used in aluminum alloy production has a hydrogen content of ≤0.10 mL / 100 g; the casting roll is a core component of the casting mill, and has a roll diameter of ≤960 mm, a crown of ≤0.30 mm, and a casting zone length of 58 to 60 mm; the casting mill also includes a casting nozzle, the nozzle outlet of which is positioned between the casting rolls. The casting nozzle comprises a front zone, a middle zone, and a rear zone. The front zone is a flat lip zone that gradually narrows forward; the rear zone is 50 mm wide; and the middle zone is divided into several channels, wherein the width of the middle channel is 17 mm, and the widths of the channels on both sides increase by 5 mm. While ensuring that the quality of the aluminum alloy billet meets the standard, the present invention successfully increases the diameter of the casting roll to 950 mm, significantly improving the service life of the casting roll and reducing production costs.

Description

Technical Field

[0001] The present invention relates to a method for effectively improving the utilization rate of casting rolls in aluminum alloy production, belonging to the technical field of aluminum alloy production. Background Art

[0002] During production, rolling mill rolls require regular grinding (or based on a certain amount of aluminum melt throughput) due to roll surface fatigue to eliminate quality defects such as cracks and ensure that billet quality meets standards. As the rolls are ground, their diameter φ gradually decreases until they become scrapped.

[0003] Taking the 1003*1900 casting and rolling mill produced by Zhuoshen Company as an example (the same applies below, and all casting and rolling mills described in this article are of this model), the roll diameter cannot be used to ensure stable plate shape when it is used to 960mm, and it is immediately scrapped. (If the plate quality is not taken into account, the roll diameter can be safely used up to about 950mm. During this period, the 10mm of available space cannot be effectively used, which is a serious waste.)

[0004] In order to reduce production cost investment, improve the effective utilization rate of rolls, optimize the grinding process and increase the number of roll uses, aluminum alloy manufacturers have been exploring and researching the direction.

[0005] Usually, with the continuous grinding and use of cast rolls, the original roll diameter will gradually become smaller, from the initial φ1003mm to φ960mm. If the conventional grinding method is continued, the plate shape of the billet will have defects such as the difference between two adjacent points exceeds the value, the longitudinal difference plate shape is unstable, and the same plate difference plate shape curve is non-parabolic. Such billets cannot meet the subsequent rolling production requirements. At this time, most people use the method of scrapping the rolls and replacing the roll sleeves to solve the problem, which costs about 280,000 yuan. Summary of the Invention

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a method for effectively improving the utilization rate of cast rolls in aluminum alloy production.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A method for effectively improving the utilization rate of casting rolls in aluminum alloy production, wherein the aluminum melt used in aluminum alloy production has a hydrogen content of ≤0.10mL / 100g; the casting roll is a core component of the casting mill, has a roll diameter of ≤960mm, a crown of ≤0.30mm, and a casting zone length of 58-60mm; the casting mill also includes a casting nozzle, an outlet of the casting nozzle is located between the casting rolls, and the casting nozzle includes a front zone, a middle zone, and a rear zone; the front zone is a flat lip zone that gradually narrows forward; the rear zone is 50mm wide; and the middle zone is divided into several channels, wherein the width of the middle channel is 17mm, and the widths of the channels on both sides increase by 5mm in sequence.

[0009] Preferably, the hydrogen content of the aluminum melt is 0.08 to 0.10 mL / 100 g.

[0010] Preferably, the aluminum alloy production includes but is not limited to the production of billets of 1 series, 3 series, 5 series, 6 series, 7 series or 8 series aluminum alloys.

[0011] Preferably, the diameter of the casting roll is 950-960 mm, and the crown is 0.15-0.30 mm.

[0012] Preferably, the casting roll comprises an upper roll and a lower roll, the roughness of the upper roll is 1 to 1.2 μm, the roughness of the lower roll is 0.6 to 0.8 μm, and the roll gap is 4.7 to 4.8 mm.

[0013] Preferably, the liquid level of the front box in the casting and rolling zone is 250-300 mm, the cooling water temperature is 25-35°C, and the cooling water flow rate is 450-500 m 3 / h, the casting and rolling speed is 800-900mm / min.

[0014] Preferably, the casting nozzle is clamped by a fixture, and the upper portion of the fixture is ground off by 2 mm using a grinder so that the casting nozzle outlet is placed between the two casting rolls.

[0015] Preferably, the casting roll is sprayed with a treatment liquid before use, and the treatment liquid is prepared by the following method in parts by weight:

[0016] (A) first heating nano-silicon carbide to 900-1000°C, keeping the temperature for 2-3 hours, and naturally cooling to 25-30°C to obtain pretreated nano-silicon carbide;

[0017] (B) Then, 1 part of pretreated nano-silicon carbide and 0.08-0.1 part of nano-tungsten disulfide are added to 40-50 parts of 10-15% ethanol aqueous solution by volume, and the mixture is stirred and mixed. Then, 2-3 parts of 1-butyl-3-methylimidazolium hexafluorophosphate are added and ultrasonic oscillation is performed to obtain the treatment solution.

[0018] Further preferably, the specific method of spraying treatment is: spraying the treatment liquid evenly on the surface of the casting roller, heating at 60-70°C for 4-5 hours, so that a film layer is formed on the surface of the casting roller, and the film layer thickness is 1-2 mm.

[0019] It is further preferred that the casting roller is surface treated before spraying. The specific method is: first mix urea, sodium ferrate, potassium carbonate, and sodium tetraborate in a mass ratio of 30-40:20-30:40-50:20-30, heat to 550-570°C to obtain a coating, and then evenly apply the coating to the surface of the casting roller preheated to the same temperature, keep warm for 30-40 minutes, cool naturally to room temperature, remove the surface coating and rinse with water 2-3 times, and air dry naturally.

[0020] More preferably, the coating thickness is 3 to 4 mm.

[0021] The above method is applied in the production of 1 series, 3 series, 5 series, 6 series, 7 series or 8 series aluminum alloys.

[0022] Beneficial effects of the present invention:

[0023] The present invention discloses a method for effectively improving the utilization rate of casting rolls in aluminum alloy production. The method comprises the following steps: the aluminum melt used in aluminum alloy production has a hydrogen content of ≤0.10 mL / 100 g; the casting roll is a core component of the casting mill, and has a roll diameter of ≤960 mm, a crown of ≤0.30 mm, and a casting zone length of 58 to 60 mm; the casting mill also includes a casting nozzle, the nozzle outlet of which is positioned between the casting rolls. The casting nozzle comprises a front zone, a middle zone, and a rear zone. The front zone is a flat lip zone that gradually narrows forward; the rear zone is 50 mm wide; and the middle zone is divided into several channels, wherein the width of the middle channel is 17 mm, and the widths of the channels on both sides increase by 5 mm. While ensuring that the quality of the aluminum alloy billet meets the standard, the present invention successfully increases the diameter of the casting roll to 950 mm, significantly improving the service life of the casting roll and reducing production costs.

[0024] The present invention successfully uses the casting roll with a roll diameter of 950 mm, which can save costs of at least 25,000 yuan.

[0025] The invention can be used for producing billets of 1 series, 3 series, 5 series, 6 series, 7 series or 8 series aluminum alloys, has a wide range of applications and broad application prospects.

[0026] This invention changes the conventional wisdom of "the smaller the roller diameter, the greater the grinding crown." Instead, it grinds the crown of small-diameter rollers to within 0.30mm. By adjusting the roughness and casting zone length, it achieves a balance between meeting aluminum alloy billet quality standards and successfully operating small-diameter casting rollers. This invention achieves aluminum alloy billet thickness differences of ≤0.03mm and medium crowns of ≤0.04mm.

[0027] The casting roller is sprayed with a treatment liquid before use. The treatment liquid is made by mixing pretreated nano-silicon carbide, nano-tungsten disulfide, ethanol aqueous solution and 1-butyl-3-methylimidazole hexafluorophosphate, which plays a lubricating role and further improves the service life of the casting roller.

[0028] Before spraying, the casting roller is surface treated by mixing urea, sodium ferrate, potassium carbonate, and sodium tetraborate, heating them to create a coating. The coating is then evenly applied to the preheated casting roller surface, which is then held at the same temperature. The roller is then allowed to cool naturally to room temperature, the coating removed, rinsed with water, and air-dried. This surface treatment increases the hardness of the casting roller through co-penetration, further extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the casting roll structure of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that the following description is only for explaining the present invention and does not limit its contents.

[0031] For comparison purposes, the following examples and comparative examples apply the method to the preparation of 3004 aluminum alloy.

[0032] Example 1:

[0033] A processing method for 3004 aluminum alloy, the specific steps are as follows:

[0034] (1) Aluminum melt was prepared according to the following chemical composition by mass percentage: 0.9% magnesium, 1.2% manganese, 0.4% iron, 0.15% silicon, 0.15% copper, and the balance aluminum; the smelting temperature was 740°C, and the smelting time was 9 hours; argon refining was performed at a refining temperature of 750°C, a refining time of 30 minutes, and refining was performed once every 4 hours; degassing was performed by filtering through a 50ppi+60ppi filter disc to obtain aluminum melt (hydrogen content 0.08mL / 100g);

[0035] (2) Casting and rolling: Aluminum melt is cast and rolled using a casting and rolling mill. The core component of the casting and rolling mill is the casting roller ( Figure 1 ), the diameter of the casting roll is 950mm, the crown is 0.15mm, the casting roll includes an upper roll and a lower roll, the roughness of the upper roll is 1μm, the roughness of the lower roll is 0.6μm, and the roll gap is 4.7mm; the length of the casting zone is 58mm; the liquid level of the front box of the casting zone is 250mm, the temperature of the front box is 715℃, the cooling water temperature is 25℃, and the cooling water flow rate is 450m 3 / h, the casting and rolling speed is 800mm / min, and the aluminum alloy billet with a thickness of 6.8mm is obtained;

[0036] The casting mill also includes a casting nozzle, with its outlet positioned between the casting rolls. The nozzle comprises a front zone, a middle zone, and a rear zone. The front zone is a flat lip that tapers forward, the rear zone is 50 mm wide, and the middle zone is divided into several channels. The center channel is 17 mm wide, with the widths of the channels on either side increasing by 5 mm. The nozzle is held in place by a fixture, and the top of the fixture is ground down by 2 mm using a grinder, ensuring that the nozzle outlet is positioned between the two casting rolls.

[0037] Example 2:

[0038] A processing method for 3004 aluminum alloy, the specific steps are as follows:

[0039] (1) Aluminum melt was prepared according to the following chemical composition in mass percentage: 0.9% magnesium, 1.2% manganese, 0.4% iron, 0.15% silicon, 0.15% copper, and the balance aluminum; the smelting temperature was 740°C, and the smelting time was 9 hours; argon refining was performed at a refining temperature of 750°C, a refining time of 30 minutes, and refining was performed once every 4 hours; degassing was performed by filtering through a 50ppi+60ppi filter disc to obtain aluminum melt (hydrogen content 0.10mL / 100g);

[0040] (2) Casting and rolling: Aluminum melt is cast and rolled using a casting and rolling mill. The core component of the casting and rolling mill is the casting roller ( Figure 1 ), the diameter of the casting roll is 950mm, the crown is 0.30mm, the casting roll includes an upper roll and a lower roll, the roughness of the upper roll is 1.2μm, the roughness of the lower roll is 0.8μm, and the roll gap is 4.8mm; the length of the casting zone is 60mm; the liquid level of the front box of the casting zone is 300mm, the temperature of the front box is 715℃, the cooling water temperature is 35℃, and the cooling water flow rate is 500m 3 / h, the casting and rolling speed is 900mm / min, and the aluminum alloy billet with a thickness of 6.8mm is obtained;

[0041] The casting mill also includes a casting nozzle, with its outlet positioned between the casting rolls. The nozzle comprises a front zone, a middle zone, and a rear zone. The front zone is a flat lip that tapers forward, the rear zone is 50 mm wide, and the middle zone is divided into several channels. The center channel is 17 mm wide, with the widths of the channels on either side increasing by 5 mm. The nozzle is held in place by a fixture, and the top of the fixture is ground down by 2 mm using a grinder, ensuring that the nozzle outlet is positioned between the two casting rolls.

[0042] Example 3:

[0043] A processing method for 3004 aluminum alloy, the specific steps are as follows:

[0044] (1) Aluminum melt was prepared according to the following chemical composition by mass percentage: 0.9% magnesium, 1.2% manganese, 0.4% iron, 0.15% silicon, 0.15% copper, and the balance aluminum; the smelting temperature was 740°C, and the smelting time was 9 hours; argon refining was performed at a refining temperature of 750°C, a refining time of 30 minutes, and refining was performed once every 4 hours; degassing was performed by filtering through a 50ppi+60ppi filter disc to obtain aluminum melt (hydrogen content 0.08mL / 100g);

[0045] (2) Casting and rolling: Aluminum melt is cast and rolled using a casting and rolling mill. The core component of the casting and rolling mill is the casting roller ( Figure 1 ), the diameter of the casting roll is 950mm, the crown is 0.15mm, the casting roll includes an upper roll and a lower roll, the roughness of the upper roll is 1.2μm, the roughness of the lower roll is 0.6μm, and the roll gap is 4.8mm; the length of the casting zone is 58mm; the liquid level of the front box of the casting zone is 300mm, the temperature of the front box is 715℃, the cooling water temperature is 25℃, and the cooling water flow rate is 500m 3 / h, the casting and rolling speed is 800mm / min, and the aluminum alloy billet with a thickness of 6.8mm is obtained;

[0046] The casting mill also includes a casting nozzle, with its outlet positioned between the casting rolls. The nozzle comprises a front zone, a middle zone, and a rear zone. The front zone is a flat lip that tapers forward, the rear zone is 50 mm wide, and the middle zone is divided into several channels. The center channel is 17 mm wide, with the widths of the channels on either side increasing by 5 mm. The nozzle is held in place by a fixture, and the top of the fixture is ground down by 2 mm using a grinder, ensuring that the nozzle outlet is positioned between the two casting rolls.

[0047] The casting roll is sprayed with a treatment liquid before use, and the treatment liquid is prepared by the following method:

[0048] (A) First, heat the nano-silicon carbide to 1000°C, keep it warm for 2 hours, and naturally cool it to 30°C to obtain pretreated nano-silicon carbide;

[0049] (B) Then, 1 kg of pretreated nano-silicon carbide and 0.08 kg of nano-tungsten disulfide were added to 50 kg of 10% ethanol aqueous solution, stirred and mixed, and then 3 kg of 1-butyl-3-methylimidazolium hexafluorophosphate was added and ultrasonically vibrated to obtain the treatment solution.

[0050] The specific method of the spraying treatment is: spraying the treatment liquid evenly on the surface of the casting roller, heating at 60° C. for 5 hours, so that a film layer is formed on the surface of the casting roller, and the film layer thickness is 1 mm.

[0051] Example 4:

[0052] A processing method for 3004 aluminum alloy, the specific steps are as follows:

[0053] (1) Aluminum melt was prepared according to the following chemical composition in mass percentage: 0.9% magnesium, 1.2% manganese, 0.4% iron, 0.15% silicon, 0.15% copper, and the balance aluminum; the smelting temperature was 740°C, and the smelting time was 9 hours; argon refining was performed at a refining temperature of 750°C, a refining time of 30 minutes, and refining was performed once every 4 hours; degassing was performed by filtering through a 50ppi+60ppi filter disc to obtain aluminum melt (hydrogen content 0.10mL / 100g);

[0054] (2) Casting and rolling: Aluminum melt is cast and rolled using a casting and rolling mill. The core component of the casting and rolling mill is the casting roller ( Figure 1 ), the diameter of the casting roll is 950mm, the crown is 0.30mm, the casting roll includes an upper roll and a lower roll, the roughness of the upper roll is 1μm, the roughness of the lower roll is 0.8μm, and the roll gap is 4.7mm; the length of the casting zone is 60mm; the liquid level of the front box of the casting zone is 250mm, the temperature of the front box is 715℃, the cooling water temperature is 35℃, and the cooling water flow rate is 450m 3 / h, the casting and rolling speed is 900mm / min, and the aluminum alloy billet with a thickness of 6.8mm is obtained;

[0055] The casting mill also includes a casting nozzle, with its outlet positioned between the casting rolls. The nozzle comprises a front zone, a middle zone, and a rear zone. The front zone is a flat lip that tapers forward, the rear zone is 50 mm wide, and the middle zone is divided into several channels. The center channel is 17 mm wide, with the widths of the channels on either side increasing by 5 mm. The nozzle is held in place by a fixture, and the top of the fixture is ground down by 2 mm using a grinder, ensuring that the nozzle outlet is positioned between the two casting rolls.

[0056] The casting roll is sprayed with a treatment liquid before use, and the treatment liquid is prepared by the following method:

[0057] (A) First, heat the nano-silicon carbide to 900°C, keep it warm for 3 hours, and naturally cool it to 25°C to obtain pretreated nano-silicon carbide;

[0058] (B) Then, 1 kg of pretreated nano-silicon carbide and 0.1 kg of nano-tungsten disulfide were added to 40 kg of 15% ethanol aqueous solution, stirred and mixed, and then 2 kg of 1-butyl-3-methylimidazolium hexafluorophosphate was added and ultrasonically vibrated to obtain the treatment solution.

[0059] The specific method of spraying treatment is: spraying the treatment liquid evenly on the surface of the casting roller, heating at 70° C. for 4 hours, so that a film layer is formed on the surface of the casting roller, and the film layer thickness is 2 mm.

[0060] Example 5:

[0061] A processing method for 3004 aluminum alloy, the specific steps are as follows:

[0062] (1) Aluminum melt was prepared according to the following chemical composition in percentage by mass: 0.9% magnesium, 1.2% manganese, 0.4% iron, 0.15% silicon, 0.15% copper, and the balance aluminum; the smelting temperature was 740°C, and the smelting time was 9 hours; argon refining was performed at a refining temperature of 750°C, a refining time of 30 minutes, and refining was performed once every 4 hours; degassing was performed by filtering through a 50ppi+60ppi filter disc to obtain aluminum melt (hydrogen content 0.09mL / 100g);

[0063] (2) Casting and rolling: Aluminum melt is cast and rolled using a casting and rolling mill. The core component of the casting and rolling mill is the casting roller ( Figure 1 ), the diameter of the casting roll is 950mm, the crown is 0.2mm, the casting roll includes an upper roll and a lower roll, the roughness of the upper roll is 1.1μm, the roughness of the lower roll is 0.7μm, and the roll gap is 4.8mm; the length of the casting zone is 59mm; the liquid level of the front box of the casting zone is 280mm, the temperature of the front box is 715℃, the cooling water temperature is 30℃, and the cooling water flow rate is 480m 3 / h, the casting and rolling speed is 850mm / min, and the aluminum alloy billet with a thickness of 6.8mm is obtained;

[0064] The casting mill also includes a casting nozzle, with its outlet positioned between the casting rolls. The nozzle comprises a front zone, a middle zone, and a rear zone. The front zone is a flat lip that tapers forward, the rear zone is 50 mm wide, and the middle zone is divided into several channels. The center channel is 17 mm wide, with the widths of the channels on either side increasing by 5 mm. The nozzle is held in place by a fixture, and the top of the fixture is ground down by 2 mm using a grinder, ensuring that the nozzle outlet is positioned between the two casting rolls.

[0065] The casting roll is sprayed with a treatment liquid before use, and the treatment liquid is prepared by the following method:

[0066] (A) First, heat the nano-silicon carbide to 950°C, keep it warm for 2.5 hours, and naturally cool it to 28°C to obtain pretreated nano-silicon carbide;

[0067] (B) Then, 1 kg of pretreated nano-silicon carbide and 0.09 kg of nano-tungsten disulfide were added to 45 kg of 12% ethanol aqueous solution, stirred and mixed, and then 2.5 kg of 1-butyl-3-methylimidazolium hexafluorophosphate was added and ultrasonically vibrated to obtain the treatment solution.

[0068] The specific method of the spraying treatment is: spraying the treatment liquid evenly on the surface of the casting roller, heating at 65° C. for 4.5 hours, so that a film layer is formed on the surface of the casting roller, and the film layer thickness is 1.5 mm.

[0069] Before spraying, the casting roller is surface treated. The specific method is: first, urea, sodium ferrate, potassium carbonate, and sodium tetraborate are evenly mixed in a mass ratio of 35:25:45:25, heated to 560 ° C, and a coating is obtained. Then, the coating is evenly applied to the surface of the casting roller preheated to the same temperature, with a coating thickness of 3.5 mm. Keep warm for 35 minutes, cool naturally to room temperature, remove the surface coating, rinse with water 3 times, and air dry naturally.

[0070] Comparative Example

[0071] A processing method for 3004 aluminum alloy, the specific steps are as follows:

[0072] (1) Aluminum melt was prepared according to the following chemical composition by mass percentage: 0.9% magnesium, 1.2% manganese, 0.4% iron, 0.15% silicon, 0.15% copper, and the balance aluminum; the smelting temperature was 740°C, and the smelting time was 9 hours; argon refining was performed at a refining temperature of 750°C, a refining time of 30 minutes, and refining was performed once every 4 hours; degassing was performed by filtering through a 50ppi+60ppi filter disc to obtain aluminum melt (hydrogen content 0.08mL / 100g);

[0073] (2) Casting and rolling: The aluminum melt is cast and rolled using a casting and rolling mill. The core component of the casting and rolling mill is the casting roll. The diameter of the casting roll is 950 mm, the crown is 0.15 mm, and the casting roll includes an upper roll and a lower roll. The roughness of the upper roll is 1 μm, the roughness of the lower roll is 0.6 μm, and the roll gap is 4.7 mm. The length of the casting and rolling zone is 58 mm. The liquid level of the front box of the casting and rolling zone is 250 mm, the temperature of the front box is 715 ° C, the cooling water temperature is 25 ° C, and the cooling water flow rate is 450 m 3 / h, the casting and rolling speed is 800mm / min, and the aluminum alloy billet with a thickness of 6.8mm is obtained;

[0074] The casting mill also includes a casting nozzle, with its outlet positioned between the casting rolls. The nozzle comprises a front zone, a middle zone, and a rear zone. The front zone is a flat lip that tapers forward, the rear zone is 50 mm wide, and the middle zone is divided into several channels. The center channel is 17 mm wide, with the widths of the channels on either side increasing by 5 mm. The nozzle is held in place by a fixture, and the top of the fixture is ground down by 2 mm using a grinder, ensuring that the nozzle outlet is positioned between the two casting rolls.

[0075] Test example

[0076] The performance of the aluminum alloy blanks obtained in Examples 1 to 5 and the comparative example was investigated, specifically including:

[0077] 1. Appearance: Visually observe whether the surface of the aluminum alloy billet is flat, smooth, and has no defects.

[0078] 2. Mechanical properties: Refer to GB / T 228-2002 "Metallic Materials Room Temperature Tensile Test Method" to test the elongation at break and tensile strength.

[0079] The performance test results are shown in Table 1.

[0080] Table 1. Performance investigation results of aluminum alloy billets

[0081] Appearance Elongation at break (%) Tensile strength (MPa) Example 1 The surface is flat and smooth, without tiger skin defects, waves or scratches 13.2 228 Example 2 The surface is flat and smooth, without tiger skin defects, waves or scratches 13.3 228 Example 3 The surface is flat and smooth, without tiger skin defects, waves or scratches 15.4 247 Example 4 The surface is flat and smooth, without tiger skin defects, waves or scratches 15.6 248 Example 5 The surface is flat and smooth, without tiger skin defects, waves or scratches 16.3 253 Comparative Example The surface is flat and smooth, with slight tiger skin defects, waves in the middle, and no scratches 12.0 216

[0082] As shown in Table 1, the 3004 aluminum alloy billets obtained in Examples 1-5 have smooth and flat surfaces, free of tiger-skin defects, waves, or scratches, and exhibit excellent mechanical properties. The casting rolls of Examples 3 and 4 were spray-treated with a treatment liquid before use, and Example 5 also underwent a surface treatment before spraying, resulting in significantly better mechanical properties.

[0083] The roughness of the upper and lower rolls in the comparative example is the same. The surface of the obtained aluminum alloy billet has slight tiger-skin defects, waves in the middle, and the mechanical properties are also significantly deteriorated, indicating that the roughness setting of the casting roll has a significant impact on the appearance and mechanical properties of the product.

[0084] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it does not limit the scope of protection of the present invention. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. A method for effectively improving the utilization rate of cast rolls in aluminum alloy production, characterized in that: Molten aluminum for aluminum alloy production, having a hydrogen content of ≤0.10 mL / 100 g; the casting roll is a core component of the casting mill, having a roll diameter of 950-960 mm, a crown of 0.15-0.30 mm, and a casting zone length of 58-60 mm; the casting mill also includes a casting nozzle, the nozzle outlet of which is located between the casting rolls, the casting nozzle comprising a front zone, a middle zone, and a rear zone, the front zone being a flat lip zone that gradually narrows forward, the rear zone being 50 mm wide, and the middle zone being divided into a plurality of channels, wherein the width of the middle channel is 17 mm, and the widths of the channels on both sides are successively increased by 5 mm; The casting roll comprises an upper roll and a lower roll, the roughness of the upper roll is 1-1.2 μm, the roughness of the lower roll is 0.6-0.8 μm, and the roll gap is 4.7-4.8 mm; The liquid level of the front box in the casting and rolling zone is 250-300 mm, the cooling water temperature is 25-35 ° C, and the cooling water flow rate is 450-500 m 3 / h, casting and rolling speed is 800~900mm / min; The casting roll is sprayed with a treatment liquid before use, and the treatment liquid is prepared by the following method in parts by weight: (A) First, heat the nano-silicon carbide to 900-1000°C, keep it warm for 2-3 hours, and naturally cool it to 25-30°C to obtain pretreated nano-silicon carbide; (B) Then, 1 part of pretreated nano-silicon carbide and 0.08-0.1 part of nano-tungsten disulfide are added to 40-50 parts of 10-15% ethanol aqueous solution by volume, stirred and mixed, and then 2-3 parts of 1-butyl-3-methylimidazolium hexafluorophosphate are added and ultrasonically oscillated to obtain the treatment solution; Before spraying, the casting roller is surface treated. The specific method is: first, urea, sodium ferrate, potassium carbonate, and sodium tetraborate are evenly mixed in a mass ratio of 30-40:20-30:40-50:20-30, and heated to 550-570°C to obtain a coating. Then, the coating is evenly applied to the surface of the casting roller preheated to the same temperature, kept warm for 30-40 minutes, and naturally cooled to room temperature. The surface coating is removed and rinsed with water 2-3 times, and then naturally air-dried.

2. The method according to claim 1, characterized in that The hydrogen content of the aluminum melt is 0.08 to 0.10 mL / 100g.

3. The method according to claim 1, characterized in that The aluminum alloy production includes but is not limited to the production of billets of 1 series, 3 series, 5 series, 6 series, 7 series or 8 series aluminum alloys.

4. The method according to claim 1, wherein The casting nozzle is clamped by a fixture, and the top of the fixture is ground off 2 mm using a grinder so that the casting nozzle outlet is placed between the two casting rolls.

5. Use of the method according to any one of claims 1 to 4 in the production of 1 series, 3 series, 5 series, 6 series, 7 series or 8 series aluminum alloys.

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